US Bridges

S23 S Central Ave over Mill Creek

Good

Warren County, Iowa · 074222704 · Structure no. 000000000332791

Built
2021
4 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete Continuous
Length
101 ft
3 main spans
Daily traffic
400
2022 count
Owner
County
County Highway Agency

About this bridge

S23 S Central Ave over Mill Creek is a concrete continuous slab carrying S23 S Central Ave over Mill Creek in Warren County, Iowa. It was built in 2021, so it is 4 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 400 vehicles a day, roughly 11% of them trucks, projected to reach 400 by 2043. The structure is 101 ft (30.8 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesS23 S Central Ave
CrossesMill Creek
Location074222704
RouteCounty Highway 0
StateIowa
Coordinates41.18576, -93.38533
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length101 ft (30.8 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2022)
Projected traffic400 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S23 S Central Ave over Mill Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is S23 S Central Ave over Mill Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does S23 S Central Ave over Mill Creek carry?

About 400 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is S23 S Central Ave over Mill Creek?

The structure is 101 ft (30.8 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns S23 S Central Ave over Mill Creek?

It is owned by the County Highway Agency.